Source Naturals L-Tryptophan 500mg， Enhances healthy mood， sleep， &amp; stress reduction， 120 Tablets<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> Helps support relaxation， restful sleep， and feeling better </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Plays a part in the synthesis of both melatonin and serotonin， hormones involved with mood and stress response </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> If needed， l-tryptophan converts to niacin in the body </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> Extremely pure and is regularly tested to ensure the highest standards of quality </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41iQ-1XswpL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Tsfl9ktuL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41x16PmcWpL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41uOV0RqCjL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41IHUP1L4qL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41n-lIwzKKL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/418cxF95ieL.jpg" noproxy>